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The Madrasas during the Abbasid period were used as the predominant instrument to foster the spread of Islamic thought as well as a way to extend the founder's pious ideals.[8]

Al-Mustansir was born in Baghdad on 1192. He was the son of Abu Nasr Muhammad (future caliph al-Zahir). His mother was a Turkish Umm walad.[5][6] called Zahra. His full name was Mansur ibn Muhammad al-Zahir and his Kunya was Abu Jaʿfar. At the time of his birth, his father was a prince. When his father ascended to the throne in 1225. His father, lowered the taxes of Iraq, and built a strong army to resist invasions. He died on 10 July 1226, nine months after his accession.

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On his father's death in 1226 he has succeeded his father Az-Zahir as the thirty-sixth Abbasid caliph in Baghdad. Al-Mustansir is particularly known for establishing the Mustansiriyya Madrasa (currently a part of the Al-Mustansiriya University) in 1227/32/34. The Madrasa, at the time, taught many subjects including medicine, mathematics, literature, grammar and Islamic religious studies, becoming a prominent and high-ranking center for Islamic studies in Baghdad.[7]

Abū Jā`far al-Mānsūr al-Mustansir bi'Llah bin al-Zâhir (Arabic: أبو جعفر المسنتصر بالله المنصور بن محمد الظاهر), better, known by his laqab al-Mustansir Bi'llah (Arabic: المسنتصر بالله),[3] (17 February 1192 – 2 December 1242) was the Caliph of the Abbasid dynasty from 1226 to 1242. He succeeded al-Zahir as caliph in the year 1226, and was the penultimate caliph to rule from Baghdad. He was the second-to-last caliph of the Abbasid Caliphate.

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The ruler of Erbil, Muzaffar ad-Din Gökböri was being without a male heir, Gökböri willed Erbil to the Abbasid caliph al-Mustansir.[9] After the death of Gökböri in 1233, the Erbil city came under Abbasid control.

Basically what the title says. How does a bearing allow a wheel to spin? I understand that they are there to reduce friction between the axle and the wheel hub. But if they reduce friction between them, the how does the axle make the wheel spin at all if theres no connection from wheel hub to axle. i dont understand how its all connected.

Al-Mustansir died on 5 December 1242.[10] His son Al-Musta'sim succeeded him as the thirty-seventh and last Caliph of the Abbasid Caliphate.

One of Al-Mustansir's concubines was Shahan. She was a Greek, and had been formerly a slave of Khata Khatun, the daughter of the commander Sunqur al-Nasiri the Tall and the wife of the commander Jamal al-Din Baklak al-Nasiri. After Al-Mustansir's accession to the throne, Khata presented Shahan to him as a gift, as part of a group of slaves. Shahan alone among them became his concubine and favourite.[11] Another of his concubines was Hajir. She was the mother of the future Caliph Al-Musta'sim.[12]